A rivers stages

A river starts at the peek of its journey. Fast, is how it goes rapidly down the steep hill. Although it is not wide it is still fast yet shallow. At the top of the mountain you will find tributes which is made from the rain all gathered up. You will see little streams coming from that or maybe even waterfalls.
The second part is where it will start to get a little deeper and a little wider. It will also get a bit slower but not much.
The final stage its at its deepest and its slowest the sea!